natural law

This expression (also jus naturale) was largely used in the philosophical speculations of the Roman jurists of the Antonine age, and was intended to denote a system of rules and principles for the guidance of human conduct which, independently of enacted law or of the systems particular to any one people, might be discovered by the rational intelligence of man, and would be found to grow out of and conform to his nature, meaning by that word his whole mental, moral, and physicalconstitution.

natural law: according to theological doctrine, divine law as revealed in nature. The doctrine of natural sexual law is that the divine purpose is procreation, and that sexual passion is sinful and immoral.